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When attempting the same thing in the SageMath cloud (CoCalc now), I received the much more helpful error message that in the file included from "gray.spyx" the variable "y" was used before it was declared. After adding in that declaration, it works fine now.

Considering I'm switching back and forth from Python to C, errors like this are bound to happen, and I'm surprised Sage's normal command line doesn't give more helpful error messages.